Negative "Percentage Surcharge" is considered as a positive one

[langerhorst]

THANK you for that wonderful integration at first.
I tried to fill in the numbers in "Configure surcharges and tax to calculate net price per kWh."
We do have a negative "percentage surcharge". As I filled in -4% the algorithm behind interpreted this as a positive surcharge. But I need a negative one. Is it possible to fix that? This way, I would be able to calculate the whole price with nearly everything in it.
Our electricity supplier has an absolute surcharge of 3.8 Cent but in addition gives us back 4%. So we would need this negative surcharge to have the right price.

[mampfes]

Hi,
if I got you right, then the following change should do the trick:
https://github.com/mampfes/ha_epex_spot/blob/main/custom_components/epex_spot/SourceShell.py#L135

< net_p = net_p + abs(net_p * surcharge_pct / 100)
> net_p = net_p + abs(net_p) * surcharge_pct / 100

Could you please test it?

[mampfes]

Fixed in release 2.2.0

[langerhorst]

I updated the EPEX plugin and found out, that there are still far to high prices.
See the attached Screenshots.
The prices should be divided by 100 - then the seem to be right.
I use aWATTar as source for the prices.

Thanks for the quick fix, maybe I configured something wrong?
"EPEX Spot Data Net Price" VS "EPEX Spot Data Price" --> I took the first one...

[mr-p666]

EPEX Spot Data Net Price is in Cent/kWh but you need EUR/kWh (as u can see in your screenshot).
I created a helper for that.

[langerhorst]

Negative Surcharge works perfect. Now I added a helper, that the price from aWATTar API converts from Cent/kWh to EUR/kWh. Tomorrow I'll see if that works. Thanks for this advice :)